ARC: boost default stacks in case of 64BIT
ARC: boost default stacks in case of 64BIT

Increase stacks required for ARCv3 64-bit CI to pass.
The CMSIS stacks are for programs in samples/portability

Signed-off-by: Eugeniy Paltsev <ec089b543c2604b626d7ce60c03e4d074ed102c7@synopsys.com>
Signed-off-by: Evgeniy Paltsev <7de4ab8b01334d64e4e84734c688a8a936513edc@gmail.com>

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